I have a 2/1971 FJ40 FST. I've been slowly getting this truck running. Right now it has s hard top on it. It's a FST when it was new. There is a wire on the driver side windshield. It goes up the side and over to the wiper motor. Half way up the windshield a wire splits off the wiper harness and goes straight up through the windshield frame. I don't think it's an interior light because it's on the dash. Any ideas? Rick